I've been using V-Control Pro by Neyrinck on my old iPad 2 for several years to control SONAR from another room, and it was great - much better than the old Frontier Tranzport. 
 
Since their recent update to version 2, I can't get anything to work.  SONAR used to be among the DAWs explicitly supported, but it is absent now (is is the only major one missing, it seems).  Worse, all the questions on the forum about the update have just disappeared. 
 
Let me know please if anyone else here is in the same situation and has had any success.  Thanks.

Hi, let preface this with acknowledging thatt I doi not have an iPad air 2 yet. It arrives on Tuesday!
I checked out the v control website and yes, Sonar is not listed. I found the documention and it lisst Sonar and version 1.9.1. However, scrolling down the documentation there is a procedure for setting up pro2 with Sonar.
I suspect that you know this already but just in case.....
Documention here:
http://vcontrolpro.com/documentation/

Somehow I had missed that.  Many thanks.  I'll try it today.

Let me know if it works!

It still works but I was having issues with the V-Window being unresponsive and I have not yet figured out how to get that to work.   They just fixed the new Vcontrol 2 for Windows support which utsed the Vcontrol 1 v1.9.    In the actual main view though, all the basic functions do still work for me.